12091430520 has 640 divisors, whose sum is σ = 47750472000. Its totient is φ = 2717245440.

The previous prime is 12091430497. The next prime is 12091430521. The reversal of 12091430520 is 2503419021.

12091430520 is a `hidden beast` number, since 1 + 20 + 91 + 4 + 30 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12091430521) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 23207860 + ... + 23208380.

Almost surely, 2^12091430520 is an apocalyptic number.

12091430520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12091430520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23875236000).

12091430520 is an abundant number, since it is smaller than the sum of its proper divisors (35659041480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12091430520 is a wasteful number, since it uses less digits than its factorization.

12091430520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 12091430520 its reverse (2503419021), we get a palindrome (14594849541).

The spelling of 12091430520 in words is "twelve billion, ninety-one million, four hundred thirty thousand, five hundred twenty".